You should get some idea of gender by the time they are 6 weeks old, sometimes earlier, sometimes later. But you won't know for sure until they crow or lay an egg. If you post a picture in the "What Breed or Gender Is This" section of your chick(s) in a couple weeks then the members here will be able to take some guesses at it.

Thanx i was told that the hens feathers at the end of there wings will start developing faster and i think 2 of my chicks are doing that so i think it's 2 boys and 2 girls :) the one out of the picture has it as well.